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The SD line goes through the point of averages, and has slope equal to SDY/SDX if the correlation coefficient r is greater than or equal to zero. The SD line has slope −SDY/SDX if r is negative. That is, the SD line climbs (sinks, if r is negative) by SDY when you move to the right by SDX. The sign of the slope of theSD line is the same as the sign of r, and the size of the slope of the SD line is SDY/SDX. In standard units, the slope of the SD line is one if r is greater than or equal to zero, and equal to minus one if r is negative. If SDX is zero, the SD line is not defined
SD line : 표준편차선
correlation coefficient r = 상관계수 r
입니다. that is 부터 무슨말인지 멘붕중이에요ㅠㅠ